Bolt connection model for multi-scale two-way coupled fire thermo-mechanical facade simulations
A multi-scale approach is proposed to simulate the fire resistance of panels used in façades of buildings: Using existing models, fire is modelled by CFD, its effects in the façade found via a thermodynamical model. Then a thermomechanical model predicts the mechanical behaviour, using linear elastic springs for the connections holding the façade panels. Each iteration, the stiffness of temperature, boundary conditions, and load type, predicts the connection behaviour, including geometric and material non-linearity, and failure. In this paper, such a detailed model is presented for a bolt connection. It will be shown that the detailed model simulates existing experiments for elevated temperatures well, and is able to predict all possible failure modes as listed in the Eurocode for ambient temperatures. It is then demonstrated that the model can also be used for all failure modes for elevated temperatures. For all modes, the strength of the connection decreases as the temperature increases, especially for temperatures higher than 400 ℃. After reaching the ultimate load, the strength of the connection decreases slower for higher temperatures than for lower temperatures. In the near future, a strategy will be developed to include the detailed models in the system simulations.
Buildings and Infrastructures
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Architecture and Building
FSF 2019 – 3nd International Symposium on Fire Safety of Facades, Paris, France, September 26-27, 2019, 1-8